Application of Band Ratios to Map Hydrothermal Alteration Zones related to Au-Sb mineralization in Freixeda, Northern Portugal

• Type: Article in International Conference Proceedings Book
• Date: 2024

Authors

Santos, D (Author) Other; Cardoso Fernandes, J (Author) FCUP; Alexandre Lima (Author) FCUP; Ana Teodoro (Author) FCUP

Conference proceedings International

Title: Proceedings of SPIE - The International Society for Optical Engineering

Final page: 24

Earth Resources and Environmental Remote Sensing/GIS Applications XV 2024

Edinburgh, 16 September 2024 through 19 September 2024

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-017-CAA

DOI: 10.1117/12.3031682

Abstract (EN): In a world where there is a growing need for new "green" technologies, there is also an increase in the demand for necessary critical raw materials (CRM) for their production and maintenance. Several CRM deposits, such as antimony (Sb) and gold (Au), occur in Iberian Peninsula. These occurrences are poorly studied in the study area, and the potential for discoveries is high. Remote sensing appears to be more environmentally friendly (non-invasive) in mapping hydrothermally altered zones associated with Au-Sb mineralizations. However, classical remote sensing methods, such as Band Ratios, are limited by the low spectral resolution of multispectral satellites. Therefore, hyperspectral satellites are of great importance for mineral mapping. This work aims to apply band ratio-based methods in a PRISMA image to map hydrothermal alteration zones related to Au-Sb mineralization. The findings of this study demonstrate the feasibility of utilizing PRISMA satellite imagery and Band Ratios techniques to map hydrothermal alteration zones associated with Au-Sb mineralization in Freixeda. The results indicate that the same Relative Band Depth (RBD) calculated to map Montmorillonite can also be effectively used to map kaolinite and vice versa. © 2024 SPIE.

Language: English

Type (Professor's evaluation): Scientific